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go-micro/debug/trace/default.go
2020-01-24 21:44:48 +00:00

90 lines
1.4 KiB
Go

package trace
import (
"context"
"time"
"github.com/google/uuid"
"github.com/micro/go-micro/util/ring"
)
type trace struct {
opts Options
// ring buffer of traces
buffer *ring.Buffer
}
func (t *trace) Read(opts ...ReadOption) ([]*Span, error) {
var options ReadOptions
for _, o := range opts {
o(&options)
}
sp := t.buffer.Get(t.buffer.Size())
var spans []*Span
for _, span := range sp {
val := span.Value.(*Span)
// skip if trace id is specified and doesn't match
if len(options.Trace) > 0 && val.Trace != options.Trace {
continue
}
spans = append(spans, val)
}
return spans, nil
}
func (t *trace) Start(ctx context.Context, name string) (context.Context, *Span) {
span := &Span{
Name: name,
Trace: uuid.New().String(),
Id: uuid.New().String(),
Started: time.Now(),
Metadata: make(map[string]string),
}
// return span if no context
if ctx == nil {
return context.Background(), span
}
s, ok := FromContext(ctx)
if !ok {
return ctx, span
}
// set trace id
span.Trace = s.Trace
// set parent
span.Parent = s.Id
// return the sapn
return ctx, span
}
func (t *trace) Finish(s *Span) error {
// set finished time
s.Duration = time.Since(s.Started)
// save the span
t.buffer.Put(s)
return nil
}
func NewTrace(opts ...Option) Trace {
var options Options
for _, o := range opts {
o(&options)
}
return &trace{
opts: options,
// the last 64 requests
buffer: ring.New(64),
}
}